SN, Dex and Instant Cast

[Tarin]

Ok, as I am slowly closing in on the magical barrier that is the Instant Cast I have a few problems, questions. That goes probably to most of the SN that allready breached the 150 Dex ;3

Idea first had been, with the Novice wings and quad dex Rod, nimble clips etc etc to reach those 150 Dex. Would have been nice, though there have been a few things changed now, as a friend told me that things could be done differently:
AoA, double Dex Lich's Bone Wand (rest stays the same).

Problem I now have is the missing Set Bonus from Angelic.
Idea that popped up: Zodiac Wings with either Pupa or Remover card, double effect > hell lot of HP. Sp I would get with the +9 LBW.

Now to the math:
AoA: 3
LBW: 3
2 x Nimble Clips: 6
Stats: 99
Bonus: 5
Bless: 10
Owl's Eye:10
=136

Improved Concentration now gives 12% Dex from Stats, Bonus, Owls Eye and Armor (now, is the AoA considered Armor or specificaly headgear and doesn't count in?)
(99+5+10) / 100 x 12 = 13,68
Now as you see, if numbers are rounded up I have my 150 Dex...if not I have a problem (and spend a few zeny in vain).

I would be very delighted if someone can show me and prove my assumptions, as I myself can't yet. Help is greatly apprechiated and thanks for any replies, sowwies for bad english (if there is any) not my first language and I am Ill righ now anyway ;3